The Katon: Issuinoyume (Kanji:火遁 ・ 一炊の夢; English: Fire Release: An Empty Dream) is the iconic jutsu of Dokushin Kamizuru. The unique fires that are generated by its utilization have been regarded as Nightmarish Flames (Romaji: Akumuen; Kanji: 悪夢炎) that produce the Fear Release (Romaji: Kyouton; Kanji: 恐遁) when subjected to Shape Transformation.